Steam-injector.



3 SHEETS-SHEET 1.

Patented June 25, 1912.

R. G. BRUOKE.

STEAM INJBGTOB.

APPLICATION FILED H1B. 27, 1912.

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R1 G. BROOKE.

STEAM INJBcToR.

APPLICATION FILED FEB. 27, 1912. 1,030,714. Patented June 25, 1912.

3 SHEETS-SHEET 2.

R. G. BROOKE.

STEAM INJECTOR.

uPLIcATIoN FILED rms. 27, 1912*.

3 SHEETS-rSHEBT 3.

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COLUMBIA PLANQGRAPH Cu.,wAsH|NGT N. D. C.

ROBERT GRUNDY BROOKE, OF MACCLESFIELD, EGLAND.

STEAM-INJECTOR.

Specification of Letters Patent.

Patented June 25, 1912.

Application filed February 27, 1912. Serial No. 680,204.

To all whom t may concern:

Be it known that I, ROBERT GRUNDY Bacone, a subject of the King of Great Britain and Ireland, residing at Macclesfield, in the count-y of Chester, England, have invented Improvements Relating to Steam-Injectors, of which the following is a specification.

This invention relates to injectors having an overflow valve or valves adapted to be closed or, after having been closed, to be prevented from opening until required, by the pressure of a fluid acting directly thereon or transmitted thereto indirectly.

In the specification of my Letters Patent N o. 97 8,000, I have described various injector arrangements embodying means for preventing` premature closure of the over-flow valve due to pressure values in the delivery chamber at starting. This is highly important but it is also equally important that the first movement of the overflow valve at starting should not be opposed. This ordinarily will not happen with the injector arrangements according to the above mentioned Letters Patent but it is nevertheless, in certain circumstances, possible for some iuid to remain imprisoned in the pressure chamber pertaining to the overflow valve sul'liciently long to oer some slight resistance to opening of the overflow valve.

The object of the present invention is to prevent such possibility ofresistance to opening by providing means which, when the injector is not at work, places the pressure chamber freely in communication with a space where pressure is not in eXcess ofthat of the atmosphere. ,The arrangements are such that the said communication is interrupted during the time that the overflow valve is being maintained closed by the fluid in the pressure chamber while the injector is at work.

The invention may be carried into effect in various ways a few of which will now be described by way of example, with reference to the accompanying drawings, of which- Figure l is a sectional elevation of part of an injector illustrating one arrangement. Fig. 2 is a similar view of another arrangement. Fig. 8 is a vertical section and Fig. 4 a section on the line A A of Fig. 3 illustrating a modified construction. Figs. 5 and 6 are views similar to Fig. 4 of other modifications.

lVhere, as is contemplated in Fig. l, the pressure chamber a pertaining to the overflow valve b is connected to the delivery c of the injector by way of a passage d and the latter is interrupted at some point in its length by a spring loaded valve for the purpose of preventing premature closure of the overflow valve Zi the said loaded valve may be made as a piston c adapted, when it is closed to establish free communication between the pressure chamber a and the atmosphere and, when opened, to interrupt such communication. The overflow valve Zi is provided with a stem b1, that worlrs through the wall b2 and constitutes valve closing means. Conveniently, the piston c may slide in the hollow part of a sleeve f adapted to be screwed into a housing in the injector body in such a way as to leave an annular space g that communicates with the pressure chamber a through passages g1. The interior of the sleeve f may be open at its outer end to the atmosphere as shown, and the control piston e be provided with a longitudinal passage 7i, lateral ports z' and, it may be, an annular groove j, adapted, when t-he piston valve is closed to the delivery of the injector, as shown, to co-actwith say lateral ports 7c in the sleeve j, and thus vent the pressure chamber a. When the injector is at work, the fluid under pressure from the delivery c of the injector will move the piston valve along the sleeve in a direction away from the valve seat until the inner end e2 of the piston valve uncovers the ports 7c, and so may pass into the annular space g around the sleeve f and thence into the pressure chamber a. The venting passage L will be closed when the piston valve c moves to admit fluid under pressure into the pressure chamber 0.l The spring m for loading the piston valve c may as shown, be disposed in the sleeve behind the piston.

l/Vhere as shown in Fig. 2, a spring loaded valve c1 controlling the communication between the delivery of the injector and the pressure chamber a is located in the latter and telescopes within say the stem b1 of the overliow valve 7), the telescoping parts may constitute a valve which, when the injector is not at work, places the pressure chamber a in free communication with the overflow outlet n of the injector. For this purpose the stem 0 of the loaded valve may be formed with lateral ports p leading to a longitudinal passage g that opens into the hollow part 1 of the overiiow valve stem, such hollow part likewise having lateral ports s leading to the overflow outlet n. In order to insure that the lateral ports p in the stem 0 of the loaded valve e1 shall be closed when the injector is at work and the overow valve b closed, the said loaded valve is formed as a piston or plunger so that it has to retract some distance before the communication be- -tween the pressure chamber a and the delivery of the injector by way of the passage u is established.

Figs. 3 and I illustrate a modified cony struction wherein the valve o controlling the passage Z between the pressure chamber a and the delivery c, is double actingvand associated with two seats w, the arrangement being such that when the injector is not at work and the valve is upon the seat w, as shown, the pressure chamber a is in communication with the overflow outlet n, by way of the passage g1 space y, passage y1 and lateral ports y2. l/Yhen on the other hand the valve c is upon the seat w the communication to the overflow outlet n is closed and the pressure chamber a connected to the delivery c of the injector.

In Fig. 5 the arrangement diiiers from that of Figs. 3 and 4@ only in that the valve fv is made as a piston and has passages o1, v2 terminating in lateral ports c3, 'o4 adapted to alternatively place the space y that leads to the pressure chamber a respectively into communication with the delivery c and overflow outlet n.

In Fig. 6 the several described elements of Fig. 5 are contained in a sleeve a that is y bodily removable from the injector casing in a similar way to the sleeve f of Fig. l.

What I claim is 1. In a steam injector, the combination with an overflow valve, means for closing said valve, a uid pressure chamber in communication with the valve-closing means and a connection for conducting fluid from the delivery of the injector to the pressure chamber, of a mechanically loaded fluid intercepting valve adapted, when closed, to ventthe pressure chamber.

2. In a steam injector, the combination with an overflow valve, means for closing said valve, a iuid pressure chamber in com Copies of this patent may be obtainedfor 3. In a steam injector, the combination Y with an overflow valve, means for closing said valve, a fluid pressure chamber in communication with the valve closing means and a connection for conducting iiuid from the delivery of the injector to the pressure chamber, of a spring loaded valve in such connection adapted in one position to intercept passage of fluid from the delivery to the pressure chamber and simultaneously establish communication between the latter and the overflow of the injector.

4f., In a steam injector, the combination with an overflow valve, means :Eor closing said valve, a fluid pressure chamber in communication with the valve closing means and a connection for conducting fluid from the delivery of the injector to the pressure chamber, of a mechanically loaded iiuid intercept ing valve arranged in such passage and having ports adapted to permit fluid from the pressure chamber to be vented through one end of the valve.

5. In a steam injector, the combination v with an overflow valve, means for closing said valve, a luld pressure chamber 1n communication with the valve closing means and a connection for conducting iiuid from Y ROBERT GRUNDY BROOKE.

Vitnesses:

ERNALD SIMPSON Mosnnnv, MALCOLM SMETHURST.

ve cents each, by addressing Vthe Commissioner of Patents, Washington, D. C. 

